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A method for directly preparing thin strip steel from iron oxide

A technology of thin strip steel and iron oxide, applied in the direction of metal rolling, etc., can solve the problems of complex preparation process, harsh working environment, high cost, etc., and achieve the effect of small equipment maintenance, increased strip density, and short process

Active Publication Date: 2021-03-30
武汉桂坤科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is in order to overcome sintering in above-mentioned traditional strip production--coking--blast furnace ironmaking--converter steelmaking--continuous casting-heating-rough hot rolling--continuous rolling--pickling--rolling- In the process of alkali cleaning, there are disadvantages of complex preparation process, high energy consumption, high cost, and harsh working environment, and a method for directly preparing thin strip steel from iron oxide is provided. The present invention directly prepares thin strip steel from iron oxide The steel method is an original technique

Method used

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  • A method for directly preparing thin strip steel from iron oxide

Examples

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example 1

[0042] Example one: the preparation of ultra-low C thin strip steel, such as figure 1 Shown:

[0043] Step 1, raw material preparation: content 99.8% high-purity Fe 2 o 3 The amount of powder added is 100g, organic binder cellulose is 1.0g, the raw materials are weighed according to the proportion, mixed in the mixer for 60min and granulated, and the particle size is 1.5mm to increase the fluidity;

[0044] Step 2, initial rolling and coiling: the raw material of 1.5mm particles is rolled in a powder vertical rolling mill according to a conventional method, and the strip thickness is controlled at 4.6-5.0mm, and coiled; the initial rolling thin strip The density is 5.3g / cm 3 ;

[0045]Step 3, place the billet in a bell furnace for initial reduction, the medium in the bell furnace is H 2 gas, the initial reduction temperature is 950°C, and the reduction time is 3 hours;

[0046] Step 4, the strip after reduction is rolled four times in the horizontal rolling mill, the thi...

example 2

[0051] Example two. Containing C thin steel strip preparation, such as figure 1 Shown:

[0052] Step 1, raw material preparation: add 100g of 200 mesh super iron ore concentrate powder with 72.1% Fe content, 0.8g of organic binder cellulose, weigh the raw materials according to the proportion, mix them in a mixer for 40min and granulate, Particles with a particle size of 1.5mm increase fluidity;

[0053] Step 2, initial rolling and coiling: the raw material of 1.5mm particles is rolled at a temperature of 110°C in a powder vertical rolling mill, and the strip thickness is controlled at 3.2-3.5mm, and coiled; the initial rolling is thin Strip density is 5.9g / cm 3 ;

[0054] Step 3, place the billet in a bell furnace for initial reduction, the medium in the bell furnace is 40% H 2 +35%CO+25%N 2 , the initial reduction temperature is 1100°C, and the reduction time is 2.0 hours;

[0055] Step 4. The strip after reduction is rolled four times in a horizontal rolling mill, the...

example 3

[0059] Example three. Containing C thin steel strip preparation, such as figure 1 Shown:

[0060] Step 1, raw material preparation: add 100g of 150 mesh super iron concentrate powder with 71.5% Fe content, 0.5g of organic binder cellulose, weigh the raw materials according to the proportion, mix them in a mixer for 30min and granulate, Particles with a particle size of 1.5mm increase fluidity;

[0061] Step 2, initial rolling and coiling: the raw material of 1.5mm particles is carried out in a powder vertical rolling mill at a temperature of 150°C for warm rolling, and the thickness of the strip is controlled at 2.0-2.3mm and coiled; the initial rolling is thin Strip density is 6.3g / cm 3 ;

[0062] Step 3, place the billet in a bell furnace for initial reduction, the medium in the bell furnace is 40% H 2 +35%CO+25%N 2 , the initial reduction temperature is 1200°C, and the reduction time is 1 hour;

[0063] Step 4. The strip after reduction is rolled three times in a hori...

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Abstract

The invention relates to a method for directly preparing a thin strip from ferric oxide. The method comprises the following steps of weighing super iron concentrate powder / iron oxide powder with the content larger than 71.5% and an organic binder according to the proportion, mixing in a mixing machine for 30-60 min, pelletizing, sequentially performing preliminary rolling and winding, reducing, rolling and winding for multiple times, and finally sequentially performing secondary sintering, bright heat treatment, finishing and winding, thereby obtaining the thin strip. During the whole production process, ironmaking, steelmaking, hot steel rolling, pickling and alkaline cleaning are not needed, as is known to all, the ironmaking and steelmaking and other processes are performed at the temperature of about 1600 DEG C, and pollution caused by ironmaking, steelmaking, steel rolling, pickling and alkaline cleaning is very serious. In the method, reducing is performed with H2 and / or CO gas,the highest temperature is about 1200 DEG C, three wastes are subjected to ultra-low emission and zero emission, and compared with a traditional ferrous metallurgy and steel powder rolling process, the method is simpler, more environmentally-friendly and more energy-saving.

Description

technical field [0001] The invention relates to a method for the direct preparation of thin strip steel from iron oxide. Background technique [0002] Current situation and development at home and abroad: With the development needs of my country's industry in 2025, the continuous improvement of production equipment in various industries and the rapid development of industries in the fields of automobiles, high-speed rail, communications, electromechanical engineering, automation equipment, and construction engineering have brought great benefits to steel and other industries. With a broad market, my country's steel production capacity has exceeded 800 million tons, and the strip steel production capacity has reached more than 50% of the steel production capacity. [0003] In the traditional steel strip production of iron and steel enterprises, there must be several key processes: sintering - coking - blast furnace ironmaking - converter steelmaking - continuous casting - heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C21B13/14B21B1/22
CPCB21B1/22C21B13/0073C21B13/14C22C33/0235
Inventor 李森蓉熊忠林李雄熊钢熊祥成
Owner 武汉桂坤科技有限公司
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